During Earth Science Week (October 8-14, 2006), millions of citizen scientists worldwide will be sampling groundwater, monitoring weather, touring quarries, exploring caves, preparing competition projects, and visiting museums and science centers to learn about Earth science. The American Geological Institute organizes this annual event to encourage better understanding of the Earth sciences and stewardship of the planet. Guided by this year's theme, Be a Citizen Scientist!, Earth Science Week 2006 activities will engage students in real research and help spread science literacy among ordinary citizens. One way to engage students in real research is through "EarthCache EventCache," organized by The Geological Society of America, a major event partner. This activity involves geocachers across the United States who will visit geological outcrops, fossil and mineral collecting sites, relevant college departments, and state geological surveys. Earth Science Week offers opportunities for students to expand their knowledge and skills by conducting scientific investigations, making observations, analyzing data, testing predictions, drawing conclusions, and contributing to the scientific process.